The U.S. Food and Drug Administration has approved Botox as a treatment for bladder problems.

Clinical studies about the treatment found that about one in ten women who had bladder problems were completely continent within six weeks of being injected with Botox.

The treatment is used for what is known as overactive bladder, which is diagnosed when the bladder squeezes too often or without warning. In the new treatment, Botox injections through the urethra block the release of the chemical that can cause spasms and temporary muscle paralysis.

“Clinical studies have demonstrated Botox’s ability to significantly reduce the frequency of urinary incontinence,” said Dr. Hylton V. Joffe, director of the Division of Reproductive and Urologic Products in FDA’s Center for Drug Evaluation and Research.

Overactive bladder affects an estimated 33 million men and women in the United States, he added.